cutout location

I've ordered some QTP cutouts (2.5") for my 66 GTO. Where is the best position to install them? I did some research and hope for more hp on the drag strip.I choose manual ones because I don't need them on the street and the electric cutouts are a source of leakage and other troubles I was told.

This is my car: https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn2/t1.0-9/10156001_4219059892103_7167230352728347328_n.jpg

I don't think I can get more hp at low rpm's, so it won't really make a difference with traction I guess. For traction I got the big Nitto Drag Tires now.

I did some maths.. again My 2.5" dual pipes have a max. flow of 1000cfm. My mufflers only flow about 500-600cfm. I'm no exhaust expert but I have reason to believe that I will loose some power at higher rpm's because of a restriction in exhaust flow.

There are now 2 sollutions... get better flowing mufflers like Hooker Max Flow (they flow about 500cfm each!) or get cutouts. I decided to try cutouts first, but I'm not sure if they should be before or after the H-Pipe. A H-Pipe is good for power, so probably it's better to use them between H and mufflers?!

- every in² of straight pipe can flow about 115cfm- 2.5" pipes have 4.4in² that equals to about 500cfm- 2x2.5" pipes without bends flow 1000cfm... with bends let's assume it's reduced about 20% to 800cfm- my mufflers flow 250-300cfm each- on the intake side there is a 750cfm Holley and a taperd spacer

So if my carb isn't way to big the exhaust will need to flow the full 800cfm at high rpm to make the most power, but my mufflers limit it to max 600cfm. The use of cutouts will eliminate the restriction from maybe 4000-6000rpm. I have no proof of my arguments, but it's only $100 to try. But even with all the maths I don't know where to place the cutouts.

The reason why I don't get better flowing mufflers to make the power all the time is: Sound... I really like the Flowmasters and I don't need some extra hp on the street because they won't be used.. with cutouts I can keep costs low, keep my Flowmaster Sound that I like and get rid of the restriction in flow on the stip.

The H Pipe is there to balance the exhaust pulses for a better flow. But with open cutouts there is no restriction in flow so it may not be necessary to use it.Maybe someone tried them before and after the crossover and can tell me if there is a difference.

After the H-Pipe the ground clearance is better.. if it doesn't matter where to place them I'll place them in front of the mufflers at position 2 on the pic.

My carb now runs a little rich. At high rpm's it's still about 12:1 AFR. I wanted to change that but maybe I'll keep it as it is and try what happens with the cutous. I can connect the sensor on the track and see if AFR is higher with open cutouts.